An interesting opinion:

The US Government Comparative Toxicogenomics database shows that Fluoride can inhibit Human immunity to viruses and pneumonia. Angiotensin I-Converting Enzyme (ACE), 2’-5’-Oligoadenylate Synthetase 1 (OAS1) and Intercellular Adhesion Molecule 1 (ICAM1) are included as susceptible epigenetic targets of the poison.

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Read 3 answers by scientists with 1 recommendation from their colleagues to the question asked by Geoff Pain on Feb 4, 2020.